1 /*****************************************************************************
2 * pulse.c : Pulseaudio output plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
5 * Copyright (C) 2009-2011 RĂ©mi Denis-Courmont
7 * Authors: Martin Hamrle <hamrle @ post . cz>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
28 #include <vlc_common.h>
29 #include <vlc_plugin.h>
33 #include <pulse/pulseaudio.h>
34 #include <vlc_pulse.h>
36 static int Open ( vlc_object_t * );
37 static void Close ( vlc_object_t * );
40 set_shortname( "PulseAudio" )
41 set_description( N_("Pulseaudio audio output") )
42 set_capability( "audio output", 160 )
43 set_category( CAT_AUDIO )
44 set_subcategory( SUBCAT_AUDIO_AOUT )
45 add_shortcut( "pulseaudio", "pa" )
46 set_callbacks( Open, Close )
50 * - pause input on policy event
51 * - resample to compensate for long term drift
52 * - select music or video stream property correctly (?)
53 * - set further appropriate stream properties
54 * - update output devices list dynamically
58 * Be careful what you do when the PulseAudio mainloop is held, which is to say
59 * within PulseAudio callbacks, or after vlc_pa_lock().
60 * In particular, a VLC variable callback cannot be triggered nor deleted with
61 * the PulseAudio mainloop lock held, if the callback acquires the lock. */
65 pa_stream *stream; /**< PulseAudio playback stream object */
66 pa_context *context; /**< PulseAudio connection context */
67 pa_volume_t base_volume; /**< 0dB reference volume */
68 pa_cvolume cvolume; /**< actual sink input volume */
69 mtime_t paused; /**< Time when (last) paused */
70 mtime_t pts; /**< Play time of buffer write offset */
71 mtime_t desync; /**< Measured desynchronization */
72 unsigned rate; /**< Current stream sample rate */
75 static void sink_input_info_cb(pa_context *, const pa_sink_input_info *,
79 static void context_cb(pa_context *ctx, pa_subscription_event_type_t type,
80 uint32_t idx, void *userdata)
82 audio_output_t *aout = userdata;
83 aout_sys_t *sys = aout->sys;
86 switch (type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK)
88 case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
89 if (idx != pa_stream_get_index(sys->stream))
90 break; /* only interested in our sink input */
92 /* Gee... PA will not provide the infos directly in the event. */
93 switch (type & PA_SUBSCRIPTION_EVENT_TYPE_MASK)
95 case PA_SUBSCRIPTION_EVENT_REMOVE:
96 msg_Err(aout, "sink input killed!");
100 op = pa_context_get_sink_input_info(ctx, idx, sink_input_info_cb,
102 if (likely(op != NULL))
103 pa_operation_unref(op);
108 default: /* unsubscribed facility?! */
115 static void sink_list_cb(pa_context *c, const pa_sink_info *i, int eol,
118 audio_output_t *aout = userdata;
119 vlc_value_t val, text;
125 msg_Dbg(aout, "listing sink %s (%"PRIu32"): %s", i->name, i->index,
127 val.i_int = i->index;
128 text.psz_string = (char *)i->description;
129 var_Change(aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text);
132 static void sink_info_cb(pa_context *c, const pa_sink_info *i, int eol,
135 audio_output_t *aout = userdata;
136 aout_sys_t *sys = aout->sys;
142 /* PulseAudio flat volume NORM / 100% / 0dB corresponds to no software
143 * amplification and maximum hardware amplification.
144 * VLC maps DEFAULT / 100% to no gain at all (software/hardware).
145 * Thus we need to use the sink base_volume as a multiplier,
146 * if and only if flat volume is active for our current sink. */
147 if (i->flags & PA_SINK_FLAT_VOLUME)
148 sys->base_volume = i->base_volume;
150 sys->base_volume = PA_VOLUME_NORM;
151 msg_Dbg(aout, "base volume: %"PRIu32, sys->base_volume);
155 /*** Latency management and lip synchronization ***/
156 static mtime_t vlc_pa_get_latency(audio_output_t *aout,
157 pa_context *ctx, pa_stream *s)
162 if (pa_stream_get_latency(s, &latency, &negative)) {
163 vlc_pa_error(aout, "unknown latency", ctx);
164 return VLC_TS_INVALID;
166 return negative ? -latency : +latency;
169 static void stream_reset_sync(pa_stream *s, audio_output_t *aout)
171 aout_sys_t *sys = aout->sys;
172 const unsigned rate = aout->format.i_rate;
174 sys->pts = VLC_TS_INVALID;
176 pa_operation *op = pa_stream_update_sample_rate(s, rate, NULL, NULL);
177 if (unlikely(op == NULL))
179 pa_operation_unref(op);
184 * Starts or resumes the playback stream.
185 * Tries start playing back audio samples at the most accurate time
186 * in order to minimize desync and resampling during early playback.
187 * @note PulseAudio lock required.
189 static void stream_resync(audio_output_t *aout, pa_stream *s)
191 aout_sys_t *sys = aout->sys;
195 assert (pa_stream_is_corked(s) > 0);
196 assert (sys->pts != VLC_TS_INVALID);
198 delta = vlc_pa_get_latency(aout, sys->context, s);
199 if (unlikely(delta == VLC_TS_INVALID))
200 delta = 0; /* screwed */
202 delta = (sys->pts - mdate()) - delta;
204 /* TODO: adjust prebuf instead of padding? */
206 size_t nb = (delta * sys->rate) / CLOCK_FREQ;
207 size_t size = aout->format.i_bytes_per_frame;
208 float *zeroes = calloc (nb, size);
210 msg_Dbg(aout, "starting with %zu zeroes (%"PRId64" us)", nb,
212 #if 0 /* Fault injector: add delay */
213 pa_stream_write(s, zeroes, nb * size, NULL, 0, PA_SEEK_RELATIVE);
214 pa_stream_write(s, zeroes, nb * size, NULL, 0, PA_SEEK_RELATIVE);
216 if (likely(zeroes != NULL))
217 if (pa_stream_write(s, zeroes, nb * size, free, 0,
218 PA_SEEK_RELATIVE) < 0)
221 msg_Warn(aout, "starting late (%"PRId64" us)", delta);
223 op = pa_stream_cork(s, 0, NULL, NULL);
225 pa_operation_unref(op);
226 op = pa_stream_trigger(s, NULL, NULL);
228 pa_operation_unref(op);
231 static void stream_latency_cb(pa_stream *s, void *userdata)
233 audio_output_t *aout = userdata;
234 aout_sys_t *sys = aout->sys;
235 mtime_t delta, change;
237 if (pa_stream_is_corked(s))
239 if (sys->pts == VLC_TS_INVALID)
241 msg_Dbg(aout, "missing latency from input");
245 /* Compute lip desynchronization */
246 delta = vlc_pa_get_latency(aout, sys->context, s);
247 if (delta == VLC_TS_INVALID)
250 delta = (sys->pts - mdate()) - delta;
251 change = delta - sys->desync;
253 //msg_Dbg(aout, "desync: %+"PRId64" us (variation: %+"PRId64" us)",
256 const unsigned inrate = aout->format.i_rate;
257 unsigned outrate = sys->rate;
260 if (delta < -AOUT_MAX_PTS_DELAY)
261 msg_Warn(aout, "too late by %"PRId64" us", -delta);
262 else if (delta > +AOUT_MAX_PTS_ADVANCE)
263 msg_Warn(aout, "too early by %"PRId64" us", delta);
264 else if (outrate == inrate)
265 return; /* In sync, do not add unnecessary disturbance! */
269 /* Compute playback sample rate */
270 /* This is empirical. Feel free to define something smarter. */
271 int adj = sync ? (outrate - inrate)
272 : outrate * (delta + change) / (CLOCK_FREQ << 4);
273 /* This avoids too quick rate variation. It sounds really bad and
274 * causes unstability (e.g. oscillation around the correct rate). */
275 int limit = inrate >> 10;
276 /* However, to improve stability and try to converge, closing to the
277 * nominal rate is favored over drifting from it. */
278 if ((adj > 0) == (sys->rate > inrate))
286 /* This keeps the effective rate within specified range
287 * (+/-AOUT_MAX_RESAMPLING% - see <vlc_aout.h>) of the nominal rate. */
288 limit = inrate * AOUT_MAX_RESAMPLING / 100;
289 if (outrate > inrate + limit)
290 outrate = inrate + limit;
291 if (outrate < inrate - limit)
292 outrate = inrate - limit;
294 /* Apply adjusted sample rate */
295 if (outrate == sys->rate)
297 pa_operation *op = pa_stream_update_sample_rate(s, outrate, NULL, NULL);
298 if (unlikely(op == NULL)) {
299 vlc_pa_error(aout, "cannot change sample rate", sys->context);
302 pa_operation_unref(op);
303 msg_Dbg(aout, "changed sample rate to %u Hz",outrate);
308 /*** Stream helpers ***/
309 static void stream_state_cb(pa_stream *s, void *userdata)
311 switch (pa_stream_get_state(s)) {
312 case PA_STREAM_READY:
313 case PA_STREAM_FAILED:
314 case PA_STREAM_TERMINATED:
322 static void stream_moved_cb(pa_stream *s, void *userdata)
324 audio_output_t *aout = userdata;
325 aout_sys_t *sys = aout->sys;
327 uint32_t idx = pa_stream_get_device_index(s);
329 msg_Dbg(aout, "connected to sink %"PRIu32": %s", idx,
330 pa_stream_get_device_name(s));
331 op = pa_context_get_sink_info_by_index(sys->context, idx,
333 if (likely(op != NULL))
334 pa_operation_unref(op);
336 /* Update the variable if someone else moved our stream */
337 var_Change(aout, "audio-device", VLC_VAR_SETVALUE,
338 &(vlc_value_t){ .i_int = idx }, NULL);
341 static void stream_overflow_cb(pa_stream *s, void *userdata)
343 audio_output_t *aout = userdata;
345 msg_Err(aout, "overflow");
349 static void stream_started_cb(pa_stream *s, void *userdata)
351 audio_output_t *aout = userdata;
353 msg_Dbg(aout, "started");
357 static void stream_suspended_cb(pa_stream *s, void *userdata)
359 audio_output_t *aout = userdata;
361 msg_Dbg(aout, "suspended");
362 stream_reset_sync(s, aout);
365 static void stream_underflow_cb(pa_stream *s, void *userdata)
367 audio_output_t *aout = userdata;
370 msg_Warn(aout, "underflow");
371 op = pa_stream_cork(s, 1, NULL, NULL);
373 pa_operation_unref(op);
374 stream_reset_sync(s, aout);
377 static int stream_wait(pa_stream *stream)
379 pa_stream_state_t state;
381 while ((state = pa_stream_get_state(stream)) != PA_STREAM_READY) {
382 if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
389 #ifdef LIBPULSE_GETS_A_CLUE
390 static void stream_success_cb(pa_stream *s, int success, void *userdata)
393 (void) s; (void) success; (void) userdata;
396 # define stream_success_cb NULL
401 static void sink_input_info_cb(pa_context *ctx, const pa_sink_input_info *i,
402 int eol, void *userdata)
404 audio_output_t *aout = userdata;
405 aout_sys_t *sys = aout->sys;
412 sys->cvolume = i->volume;
413 volume = pa_cvolume_max(&i->volume) / (float)PA_VOLUME_NORM;
414 aout_VolumeHardSet(aout, volume, i->mute);
418 /*** VLC audio output callbacks ***/
420 /* Memory free callback. The block_t address is in front of the data. */
421 static void data_free(void *data)
423 block_t **pp = data, *block;
425 memcpy(&block, pp - 1, sizeof (block));
426 block_Release(block);
429 static void *data_convert(block_t **pp)
431 block_t *block = *pp;
432 /* In most cases, there is enough head room, and this is really cheap: */
433 block = block_Realloc(block, sizeof (block), block->i_buffer);
435 if (unlikely(block == NULL))
438 memcpy(block->p_buffer, &block, sizeof (block));
439 block->p_buffer += sizeof (block);
440 block->i_buffer -= sizeof (block);
441 return block->p_buffer;
445 * Queue one audio frame to the playabck stream
447 static void Play(audio_output_t *aout)
449 aout_sys_t *sys = aout->sys;
450 pa_stream *s = sys->stream;
452 /* This function is called exactly once per block in the output FIFO. */
453 block_t *block = aout_FifoPop(&aout->fifo);
454 assert (block != NULL);
456 const void *ptr = data_convert(&block);
457 if (unlikely(ptr == NULL))
460 size_t len = block->i_buffer;
461 mtime_t pts = block->i_pts + block->i_length;
463 /* Note: The core already holds the output FIFO lock at this point.
464 * Therefore we must not under any circumstances (try to) acquire the
465 * output FIFO lock while the PulseAudio threaded main loop lock is held
466 * (including from PulseAudio stream callbacks). Otherwise lock inversion
467 * will take place, and sooner or later a deadlock. */
471 if (pa_stream_is_corked(s) > 0)
472 stream_resync(aout, s);
474 #if 0 /* Fault injector to test underrun recovery */
475 static volatile unsigned u = 0;
476 if ((++u % 1000) == 0) {
477 msg_Err(aout, "fault injection");
478 pa_operation_unref(pa_stream_flush(s, NULL, NULL));
482 if (pa_stream_write(s, ptr, len, data_free, 0, PA_SEEK_RELATIVE) < 0) {
483 vlc_pa_error(aout, "cannot write", sys->context);
484 block_Release(block);
491 * Cork or uncork the playback stream
493 static void Pause(audio_output_t *aout, bool paused, mtime_t date)
495 aout_sys_t *sys = aout->sys;
496 pa_stream *s = sys->stream;
503 op = pa_stream_cork(s, paused, NULL, NULL);
505 pa_operation_unref(op);
507 assert (sys->paused != VLC_TS_INVALID);
509 msg_Dbg(aout, "resuming after %"PRId64" us", date);
510 sys->paused = VLC_TS_INVALID;
512 stream_resync(aout, s);
518 static int VolumeSet(audio_output_t *aout, float vol, bool mute)
520 aout_sys_t *sys = aout->sys;
522 uint32_t idx = pa_stream_get_index(sys->stream);
524 pa_cvolume cvolume = sys->cvolume;
525 pa_volume_t volume = sys->base_volume;
527 pa_cvolume_scale(&cvolume, PA_VOLUME_NORM); /* preserve balance */
529 /* VLC provides the software volume so convert directly to PulseAudio
530 * software volume, pa_volume_t. This is not a linear amplification factor
531 * so do not use PulseAudio linear amplification! */
532 vol *= PA_VOLUME_NORM;
533 if (unlikely(vol >= PA_VOLUME_MAX))
535 volume = pa_sw_volume_multiply(volume, lround(vol));
536 pa_sw_cvolume_multiply_scalar(&cvolume, &cvolume, volume);
538 assert(pa_cvolume_valid(&cvolume));
541 op = pa_context_set_sink_input_volume(sys->context, idx, &cvolume, NULL, NULL);
542 if (likely(op != NULL))
543 pa_operation_unref(op);
544 op = pa_context_set_sink_input_mute(sys->context, idx, mute, NULL, NULL);
545 if (likely(op != NULL))
546 pa_operation_unref(op);
552 static int StreamMove(vlc_object_t *obj, const char *varname, vlc_value_t old,
553 vlc_value_t val, void *userdata)
555 audio_output_t *aout = (audio_output_t *)obj;
556 aout_sys_t *sys = aout->sys;
557 pa_stream *s = userdata;
559 uint32_t idx = pa_stream_get_index(s);
560 uint32_t sink_idx = val.i_int;
562 (void) varname; (void) old;
565 op = pa_context_move_sink_input_by_index(sys->context, idx, sink_idx,
567 if (likely(op != NULL)) {
568 pa_operation_unref(op);
569 msg_Dbg(aout, "moving to sink %"PRIu32, sink_idx);
571 vlc_pa_error(obj, "cannot move sink", sys->context);
574 return (op != NULL) ? VLC_SUCCESS : VLC_EGENERIC;
579 * Create a PulseAudio playback stream, a.k.a. a sink input.
581 static int Open(vlc_object_t *obj)
583 audio_output_t *aout = (audio_output_t *)obj;
586 /* Sample format specification */
587 struct pa_sample_spec ss;
588 vlc_fourcc_t format = aout->format.i_format;
593 format = VLC_CODEC_F32B;
595 ss.format = PA_SAMPLE_FLOAT32BE;
598 format = VLC_CODEC_F32L;
600 ss.format = PA_SAMPLE_FLOAT32LE;
603 format = VLC_CODEC_FL32;
604 ss.format = PA_SAMPLE_FLOAT32NE;
607 ss.format = PA_SAMPLE_S32BE;
610 ss.format = PA_SAMPLE_S32LE;
613 ss.format = PA_SAMPLE_S24BE;
616 ss.format = PA_SAMPLE_S24LE;
619 ss.format = PA_SAMPLE_S16BE;
622 ss.format = PA_SAMPLE_S16LE;
625 format = VLC_CODEC_U8;
627 ss.format = PA_SAMPLE_U8;
632 format = VLC_CODEC_FL32;
633 ss.format = PA_SAMPLE_FLOAT32NE;
637 format = VLC_CODEC_S16N;
638 ss.format = PA_SAMPLE_S16NE;
643 ss.rate = aout->format.i_rate;
644 ss.channels = aout_FormatNbChannels(&aout->format);
645 if (!pa_sample_spec_valid(&ss)) {
646 msg_Err(aout, "unsupported sample specification");
650 /* Channel mapping (order defined in vlc_aout.h) */
651 struct pa_channel_map map;
654 if (aout->format.i_physical_channels & AOUT_CHAN_LEFT)
655 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
656 if (aout->format.i_physical_channels & AOUT_CHAN_RIGHT)
657 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
658 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLELEFT)
659 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
660 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLERIGHT)
661 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
662 if (aout->format.i_physical_channels & AOUT_CHAN_REARLEFT)
663 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
664 if (aout->format.i_physical_channels & AOUT_CHAN_REARRIGHT)
665 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
666 if (aout->format.i_physical_channels & AOUT_CHAN_REARCENTER)
667 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
668 if (aout->format.i_physical_channels & AOUT_CHAN_CENTER)
670 if (ss.channels == 1)
671 map.map[map.channels++] = PA_CHANNEL_POSITION_MONO;
673 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
675 if (aout->format.i_physical_channels & AOUT_CHAN_LFE)
676 map.map[map.channels++] = PA_CHANNEL_POSITION_LFE;
678 for (unsigned i = 0; map.channels < ss.channels; i++) {
679 map.map[map.channels++] = PA_CHANNEL_POSITION_AUX0 + i;
680 msg_Warn(aout, "mapping channel %"PRIu8" to AUX%u", map.channels, i);
683 if (!pa_channel_map_valid(&map)) {
684 msg_Err(aout, "unsupported channel map");
687 const char *name = pa_channel_map_to_name(&map);
688 msg_Dbg(aout, "using %s channel map", (name != NULL) ? name : "?");
691 /* Stream parameters */
692 const pa_stream_flags_t flags = PA_STREAM_START_CORKED
693 //| PA_STREAM_INTERPOLATE_TIMING
694 | PA_STREAM_AUTO_TIMING_UPDATE
695 | PA_STREAM_VARIABLE_RATE;
697 struct pa_buffer_attr attr;
699 /* PulseAudio assumes that tlength bytes are available in the buffer. Thus
700 * we need to be conservative and set the minimum value that the VLC
701 * audio decoder thread warrants. Otherwise, PulseAudio buffers will
702 * underrun on hardware with large buffers. VLC keeps at least
703 * AOUT_MIN_PREPARE and at most AOUT_MAX_PREPARE worth of audio buffers.
704 * TODO? tlength could be adaptively increased to reduce wakeups. */
705 attr.tlength = pa_usec_to_bytes(AOUT_MIN_PREPARE_TIME, &ss);
706 attr.prebuf = 0; /* trigger manually */
708 attr.fragsize = 0; /* not used for output */
710 /* Allocate structures */
711 aout_sys_t *sys = malloc(sizeof(*sys));
712 if (unlikely(sys == NULL))
715 pa_context *ctx = vlc_pa_connect (obj);
725 sys->paused = VLC_TS_INVALID;
726 sys->pts = VLC_TS_INVALID;
731 const pa_subscription_mask_t mask = PA_SUBSCRIPTION_MASK_SINK_INPUT;
733 pa_context_set_subscribe_callback(ctx, context_cb, aout);
734 op = pa_context_subscribe(ctx, mask, NULL, NULL);
735 if (likely(op != NULL))
736 pa_operation_unref(op);
739 sys->base_volume = PA_VOLUME_NORM;
740 pa_cvolume_set(&sys->cvolume, ss.channels, PA_VOLUME_NORM);
743 /* Create a playback stream */
744 pa_stream *s = pa_stream_new(ctx, "audio stream", &ss, &map);
746 vlc_pa_error(obj, "stream creation failure", ctx);
750 pa_stream_set_state_callback(s, stream_state_cb, NULL);
751 pa_stream_set_latency_update_callback(s, stream_latency_cb, aout);
752 pa_stream_set_moved_callback(s, stream_moved_cb, aout);
753 pa_stream_set_overflow_callback(s, stream_overflow_cb, aout);
754 pa_stream_set_started_callback(s, stream_started_cb, aout);
755 pa_stream_set_suspended_callback(s, stream_suspended_cb, aout);
756 pa_stream_set_underflow_callback(s, stream_underflow_cb, aout);
758 if (pa_stream_connect_playback(s, NULL, &attr, flags, NULL, NULL) < 0
760 vlc_pa_error(obj, "stream connection failure", ctx);
764 const struct pa_buffer_attr *pba = pa_stream_get_buffer_attr(s);
765 msg_Dbg(aout, "using buffer metrics: maxlength=%u, tlength=%u, "
766 "prebuf=%u, minreq=%u",
767 pba->maxlength, pba->tlength, pba->prebuf, pba->minreq);
769 aout->i_nb_samples = pba->minreq / pa_frame_size(&ss);
771 var_Create(aout, "audio-device", VLC_VAR_INTEGER|VLC_VAR_HASCHOICE);
772 var_Change(aout, "audio-device", VLC_VAR_SETTEXT,
773 &(vlc_value_t){ .psz_string = (char *)_("Audio device") },
775 var_AddCallback (aout, "audio-device", StreamMove, s);
776 op = pa_context_get_sink_info_list(ctx, sink_list_cb, aout);
777 /* We may need to wait for completion... once LibVLC supports this */
779 pa_operation_unref(op);
780 stream_moved_cb(s, aout);
783 aout->format.i_format = format;
784 aout->pf_play = Play;
785 aout->pf_pause = Pause;
786 aout->pf_volume_set = VolumeSet;
796 * Removes a PulseAudio playback stream
798 static void Close (vlc_object_t *obj)
800 audio_output_t *aout = (audio_output_t *)obj;
801 aout_sys_t *sys = aout->sys;
802 pa_context *ctx = sys->context;
803 pa_stream *s = sys->stream;
806 /* The callback takes mainloop lock, so it CANNOT be held here! */
807 var_DelCallback (aout, "audio-device", StreamMove, s);
808 var_Destroy (aout, "audio-device");
815 if (pa_stream_is_corked(s) > 0)
816 /* Stream paused: discard all buffers */
817 op = pa_stream_flush(s, stream_success_cb, NULL);
819 /* Stream playing: wait until buffers are played */
820 op = pa_stream_drain(s, stream_success_cb, NULL);
821 if (likely(op != NULL)) {
822 #ifdef LIBPULSE_GETS_A_CLUE
823 while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
826 pa_operation_unref(op);
829 pa_stream_disconnect(s);
834 vlc_pa_disconnect(obj, ctx);